Revenue from contracts (Tables)

6 Months Ended

Jun. 30, 2018

Revenue from contracts

Schedule of disaggregation of revenue

	Three Months Ended June 30, 2018
							Un-Allocated		Consolidated
	East U.S.		West U.S.		Canada		Corporate		Total
Project revenue:
Energy sales	$	21.6	$	1.7	$	8.1	$	—	$	31.4
Energy capacity revenue		13.6		6.8		2.9		—		23.3
Steam energy and capacity revenue		0.4		—		—		—		0.4
Waste heat revenue		—		—				—		—
Enhanced dispatch contracts		—		—		6.4		—		6.4
Ancillary and transmission services		3.4		—		1.3		—		4.7
Asset management and operation		—		—		—		—		—
Miscellaneous revenue		—		(0.2)				0.2		—
		39.0		8.3		18.7		0.2		66.2

	Three Months Ended June 30, 2017
								Un-Allocated		Consolidated
		East U.S.		West U.S.		Canada		Corporate		Total
Project revenue:
Energy sales	$	24.4	$	7.8	$	7.8	$	—	$	40.0
Energy capacity revenue		12.4		13.3		2.6		—		28.3
Steam energy and capacity revenue		2.6		7.1		—		—		9.7
Waste heat revenue		—		—		0.1		—		0.1
Enhanced dispatch contracts		—		—		40.8		—		40.8
Ancillary and transmission services		1.0		—		4.1		—		5.1
Asset management and operation		—		—		—		0.3		0.3
Miscellaneous revenue		—		(0.3)		—		—		(0.3)
		40.4		27.9		55.4		0.3		124.0

	Six Months Ended June 30, 2018
							Un-Allocated		Consolidated
	East U.S.		West U.S.		Canada		Corporate		Total
Project revenue:
Energy sales	$	47.0	$	6.8	$	16.0	$	—	$	69.8
Energy capacity revenue		24.9		12.7		5.8		—		43.4
Steam energy and capacity revenue		0.9		2.8		—		—		3.7
Waste heat revenue		—		—		0.1		—		0.1
Enhanced dispatch contracts		—		—		15.0		—		15.0
Ancillary and transmission services		7.8		—		6.3		—		14.1
Asset management and operation		—		—		—		—		—
Miscellaneous revenue		—		(0.4)		—		0.5		0.1
		80.6		21.9		43.2		0.5		146.2

	Six Months Ended June 30, 2017
								Un-Allocated		Consolidated
		East U.S.		West U.S.		Canada		Corporate		Total
Project revenue:
Energy sales	$	46.2	$	16.2	$	14.7	$	—	$	77.1
Energy capacity revenue		22.5		20.0		5.3		—		47.8
Steam energy and capacity revenue		5.9		15.6		—		—		21.5
Waste heat revenue		—		—		0.3		—		0.3
Enhanced dispatch contracts		—		—		65.0		—		65.0
Ancillary and transmission services		1.9		—		8.8		—		10.7
Asset management and operation		—		—		—		0.5		0.5
Miscellaneous revenue		—		(0.5)		—		—		(0.5)
		76.5		51.3		94.1		0.5		222.4

Schedule of receivables, contract assets and contract liabilities from contracts

	June 30,		December 31,
	2018		2017
Accounts receivables	$	25.3	$	52.7
Contract assets		—		—
Contract liabilities		0.6		1.0